| 摘要 |
Printing unit for a rotary offset printing press having a plate cylinder bearing a printing plate suitable for offset-printing operation free of dampening solution, and an inking unit with a multiplicity of inking rollers for inking the printing plate during operation with a printing ink suitable for offset-printing operation free of dampening solution includes an auxiliary roller bringable, independently of the inking rollers, into engagement with and out of engagement from the printing plate, the auxiliary roller, at least in a first operating position thereof wherein it is in engagement with the printing plate, being rotatable opposite to the direction of rotation of the plate cylinder at a circumferential speed different from the circumferential speed of the plate cylinder and, in a second operating position thereof wherein it is out of engagement with the printing plate, forming a component or constituent part of the inking unit.
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